To update/upgrade or not to update/upgrade

The question is relevant when you have a environment that you want to keep stable.

Generally I recommend that you update your software - there are a lot of security updates as well as new functionality. But when running Centos in a virtualbox environment the security matters are less important. Therefore you can leave your system as is for a semester and update/upgrade in the break.

As of time of writing, October 2019, there are problems with the combination of VirtualBox 6.0.10 and 6.0.12 and Centos 7.6 and 7.7.

If you downgrade your VirtualBox 6.0.8 and remember to install the extension pack for the version installed (e.g. 6.0.8) you should be able to get something working correct. (Also remember to install the extension pack in the guest (Centos).)

Boot on a kernel prior to 3.10.0-1062 e.g. 3.10.0-862

To boot on this kernel every time install the grub-optimizer - a graphical utility that enables you to edit the boot loader settings.

]$ sudoyum install grub-customizer

run it by typing

]$ sudo grub-customizer

Go to the general tab and select the wanted kernel to be default, e.g. 3.10.0-957.27.2